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Forward osmosis

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https://www.readbyqxmd.com/read/28207245/regenerable-polyelectrolyte-membrane-for-ultimate-fouling-control-in-forward-osmosis
#1
Yan Kang, Sunxiang Zheng, Casey Finnerty, Michael J Lee, Baoxia Mi
This study demonstrated the feasibility of using regenerable polyelectrolyte membranes to ultimately control the irreversible membrane fouling in a forward osmosis (FO) process. The regenerable membrane was fabricated by assembling multiple polyethyleneimine (PEI) and poly(acrylic acid) (PAA) bilayers on a polydopamine-functionalized polysulfone support. The resulting membrane exhibited higher water flux and lower solute flux in FO mode (with the active layer facing feed solution) than in PRO mode (with the active layer facing draw solution) using trisodium citrate as draw solution, most likely due to the unique swelling behavior of the polyelectrolyte membrane...
February 16, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28186405/thin-film-nanocomposite-tfn-membranes-incorporated-with-super-hydrophilic-metal-organic-framework-mof-uio-66-toward-enhancement-of-water-flux-and-salt-rejection
#2
Dangchen Ma, Shing Bo Peh, Gang Han, Shing Bor Chen
Zirconiumv (IV)-carboxylate metal-organic framework (MOF) UiO-66 nanoparticles were successfully synthesized and incorporated in the polyamide (PA) selective layer to fabricate novel thin-film nanocomposite (TFN) membranes. Compared to unmodified pure polyamide thin-film composite (TFC) membranes, the incorporation of UiO-66 nanoparticles significantly changes the membrane morphology and chemistry, leading to an improvement of intrinsic separation properties due to the molecular sieving and superhydrophilic nature of UiO-66 particles...
February 17, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28094920/antifouling-thin-film-composite-membranes-by-controlled-architecture-of-zwitterionic-polymer-brush-layer
#3
Caihong Liu, Jongho Lee, Jun Ma, Menachem Elimelech
In this study, we demonstrate a highly antifouling thin-film composite (TFC) membrane by grafting a zwitterionic polymer brush via atom-transfer radical-polymerization (ATRP), a controlled, environmentally benign chemical process. Initiator molecules for polymerization were immobilized on the membrane surface by bioinspired catechol chemistry, leading to the grafting of a dense zwitterionic polymer brush layer. Surface characterization revealed that the modified membrane exhibits reduced surface roughness, enhanced hydrophilicity, and lower surface charge...
February 2, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28067521/nanoscale-dynamics-versus-surface-interactions-what-dictates-osmotic-transport
#4
C Lee, C Cottin-Bizonne, R Fulcrand, L Joly, C Ybert
The classical paradigm for osmotic transport has long related the induced-flow direction to the solute membrane interactions, with the low-to-high concentration flow a direct consequence of the solute rejection from the semipermeable membrane. In principle, the same was thought to occur for the newly demonstrated membrane-free osmotic transport named diffusio-osmosis. Using a recently proposed nanofluidic setup, we revisit this cornerstone of osmotic transport by studying the diffusio-osmotic flows generated at silica surfaces by either poly(ethylene)glycol polymers or ethanol molecules in aqueous solutions...
January 19, 2017: Journal of Physical Chemistry Letters
https://www.readbyqxmd.com/read/28033494/forward-osmosis-as-an-approach-to-manage-oil-sands-tailings-water-and-on-site-basal-depressurization-water
#5
Shu Zhu, Mingyu Li, Mohamed Gamal El-Din
As the volume of oil sands process-affected water (OSPW) stored in tailings ponds increases, it is urgent to seek for water management approaches to alleviate the environmental impact caused by large quantity of toxic water. Forward osmosis (FO) utilizes osmotic pressure difference between two solutions, thereby giving a potential to manage two wastewaters. In this study, FO was proposed to manage OSPW, using on-site waste basal depressurization water (BDW) as draw solution. To investigate its feasibility, both short and long-term OSPW desalination experiments were carried out...
December 21, 2016: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/27998785/integrating-microbial-fuel-cells-with-anaerobic-acidification-and-forward-osmosis-membrane-for-enhancing-bio-electricity-and-water-recovery-from-low-strength-wastewater
#6
Jinmeng Liu, Xinhua Wang, Zhiwei Wang, Yuqin Lu, Xiufen Li, Yueping Ren
Microbial fuel cells (MFCs) and forward osmosis (FO) are two emerging technologies with great potential for energy-efficient wastewater treatment. In this study, anaerobic acidification and FO membrane were simultaneously integrated into an air-cathode MFC (AAFO-MFC) for enhancing bio-electricity and water recovery from low-strength wastewater. During a long-term operation of approximately 40 days, the AAFO-MFC system achieved a continuous and relatively stable power generation, and the maximum power density reached 4...
December 10, 2016: Water Research
https://www.readbyqxmd.com/read/27973983/application-of-a-nanofibrous-composite-membrane-to-the-fertilizer-driven-forward-osmosis-process-for-irrigation-water-use
#7
Hee-Kyung An, Chang-Gu Lee, Seong-Jik Park
In this study, we fabricated a nanofibrous composite (NFC) membrane as a substrate to produce forward osmosis (FO) membranes, and we also assessed the use of liquid fertilizer as a draw solution for the FO process in order to produce agricultural irrigation water. Commercial cellulose triacetate (CTA) and thin-film composite (TFC) FO membranes were included in this study. Under FO tests, the NFC, CTA, and TFC membranes achieved initial osmotic water flux values of 35.31, 6.85, and 3.31 L/m(2)·h and final osmotic water flux values of 12...
January 4, 2017: Environmental Technology
https://www.readbyqxmd.com/read/27966852/balancing-osmotic-pressure-of-electrolytes-for-nanoporous-membrane-vanadium-redox-flow-battery-with-a-draw-solute
#8
Ligen Yan, Dan Li, Shuaiqiang Li, Zhi Xu, Junhang Dong, Wenheng Jing, Weihong Xing
Vanadium redox flow batteries with nanoporous membranes (VRFBNM) have been demonstrated to be good energy storage devices. Yet the capacity decay due to permeation of vanadium and water makes their commercialization very difficult. Inspired by the forward osmosis (FO) mechanism, the VRFBNM battery capacity decrease was alleviated by adding a soluble draw solute (e.g., 2-methylimidazole) into the catholyte, which can counterbalance the osmotic pressure between the positive and negative half-cell. No change of the electrolyte volume has been observed after VRFBNM being operated for 55 h, revealing that the permeation of water and vanadium ions was effectively limited...
December 28, 2016: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/27934283/a-method-for-seawater-desalination-via-squeezing-ionic-hydrogels
#9
Chi Yu, Yanhong Wang, Xuemei Lang, Shuanshi Fan
In this study, mechanical force applied to squeeze poly(sodium acrylate-co-2-hydroxyethyl methacrylate) hydrogels that contained seawater in order to obtain fresh water. By incorporating ionic monomer sodium acrylate (SA) into hydrogels, the salt rejection was significantly enhanced from 27.62% to 64.57% (feed concentration 35.00g/L NaCl solution). As SA's concentration continuously increased, salt rejection declined due to the change in hydrogel's matrix structure. Therefore, water recovery raised as the current swelling degree increased...
December 6, 2016: Environmental Science & Technology
https://www.readbyqxmd.com/read/27889657/evaluation-of-fertilizer-drawn-forward-osmosis-for-sustainable-agriculture-and-water-reuse-in-arid-regions
#10
Laura Chekli, Youngjin Kim, Sherub Phuntsho, Sheng Li, Noreddine Ghaffour, TorOve Leiknes, Ho Kyong Shon
The present study focused on the performance of the FDFO process to achieve simultaneous water reuse from wastewater and production of nutrient solution for hydroponic application. Bio-methane potential (BMP) measurements were firstly carried out to determine the effect of osmotic concentration of wastewater achieved in the FDFO process on the anaerobic activity. Results showed that 95% water recovery from the FDFO process is the optimum value for further AnMBR treatment. Nine different fertilizers were then tested based on their FO performance (i...
February 1, 2017: Journal of Environmental Management
https://www.readbyqxmd.com/read/27883917/osmotic-versus-conventional-membrane-bioreactors-integrated-with-reverse-osmosis-for-water-reuse-biological-stability-membrane-fouling-and-contaminant-removal
#11
Wenhai Luo, Hop V Phan, Ming Xie, Faisal I Hai, William E Price, Menachem Elimelech, Long D Nghiem
This study systematically compares the performance of osmotic membrane bioreactor - reverse osmosis (OMBR-RO) and conventional membrane bioreactor - reverse osmosis (MBR-RO) for advanced wastewater treatment and water reuse. Both systems achieved effective removal of bulk organic matter and nutrients, and almost complete removal of all 31 trace organic contaminants investigated. They both could produce high quality water suitable for recycling applications. During OMBR-RO operation, salinity build-up in the bioreactor reduced the water flux and negatively impacted the system biological treatment by altering biomass characteristics and microbial community structure...
February 1, 2017: Water Research
https://www.readbyqxmd.com/read/27854275/separation-of-peptides-with-forward-osmosis-biomimetic-membranes
#12
Niada Bajraktari, Henrik T Madsen, Mathias F Gruber, Sigurd Truelsen, Elzbieta L Jensen, Henrik Jensen, Claus Hélix-Nielsen
Forward osmosis (FO) membranes have gained interest in several disciplines for the rejection and concentration of various molecules. One application area for FO membranes that is becoming increasingly popular is the use of the membranes to concentrate or dilute high value compound solutions such as pharmaceuticals. It is crucial in such settings to control the transport over the membrane to avoid losses of valuable compounds, but little is known about the rejection and transport mechanisms of larger biomolecules with often flexible conformations...
November 15, 2016: Membranes
https://www.readbyqxmd.com/read/27836176/silica-scaling-in-forward-osmosis-from-solution-to-membrane-interface
#13
Ming Xie, Stephen R Gray
Membrane silica scaling hinders sustainable water production. Understanding silica scaling mechanisms provides options for better membrane process management. In this study, we elucidated silica scaling mechanisms on an asymmetric cellulose triacetate (CTA) membrane and polyamide thin-film composite (TFC) membrane. Scaling filtration showed that TFC membrane was subjected to more severe water flux decline in comparison with the CTA membrane, together with different scaling layer morphology. To elucidate the silica scaling mechanisms, silica species in the aqueous solution were characterised by mass spectrometry as well as light scattering...
January 1, 2017: Water Research
https://www.readbyqxmd.com/read/27802786/influences-of-mechanical-pre-treatment-on-the-non-biological-treatment-of-municipal-wastewater-by-forward-osmosis
#14
Tobias Hey, Agata Zarebska, Niada Bajraktari, Jörg Vogel, Claus Hélix-Nielsen, Jes la Cour Jansen, Karin Jönsson
Municipal wastewater treatment commonly involves mechanical, biological and chemical treatment steps as state-of-the-art technologies for protecting the environment from adverse effects. The biological treatment step consumes the most energy and can create greenhouse gases. This study investigates municipal wastewater treatment without the biological treatment step, including the effects of different pre-treatment configurations, e.g., direct membrane filtration before forward osmosis. Forward osmosis was tested using raw wastewater and wastewater subjected to different types of mechanical pre-treatment, e...
November 2, 2016: Environmental Technology
https://www.readbyqxmd.com/read/27776465/the-effects-of-physicochemical-wastewater-treatment-operations-on-forward-osmosis
#15
Tobias Hey, Niada Bajraktari, Jörg Vogel, Claus Hélix Nielsen, Jes la Cour Jansen, Karin Jönsson
Raw municipal wastewater from a full-scale wastewater treatment plant was physicochemically pretreated in a large pilot-scale system comprising coagulation, flocculation, microsieve and microfiltration operated in various configurations. The produced microsieve filtrates and microfiltration permeates were then concentrated using forward osmosis (FO). Aquaporin Inside(TM) FO membranes were used for both the microsieve filtrate and microfiltration permeates, and Hydration Technologies Inc.-thin-film composite membranes for the microfiltration permeate using only NaCl as the draw solution...
October 24, 2016: Environmental Technology
https://www.readbyqxmd.com/read/27776229/a-novel-forward-osmosis-system-in-landfill-leachate-treatment-for-removing-polycyclic-aromatic-hydrocarbons-and-for-direct-fertigation
#16
Jing Li, Aping Niu, Chun-Jiao Lu, Jing-Hui Zhang, Muhammad Junaid, Phyllis R Strauss, Ping Xiao, Xiao Wang, Yi-Wei Ren, De-Sheng Pei
Landfill leachate (LL) is harmful to aquatic environment because it contains high concentrations of dissolved organic matter, inorganic components, heavy metals, and other xenobiotics. Thus, the remediation of LL is crucial for environmental conservation. Here, a potential application of the forward osmosis (FO) filtration process with ammonium bicarbonate (NH4HCO3) as a draw solution (DS) was investigated to remediate membrane bioreactor-treated LL (M-LL). After the leachate treatment, the toxicity and removal efficiencies of polycyclic aromatic hydrocarbons (PAHs) were evaluated using zebrafish and cultured human cells...
February 2017: Chemosphere
https://www.readbyqxmd.com/read/27773265/ultrasound-assisted-forward-osmosis-concentration-of-fruit-juice-and-natural-colorant
#17
B S Chanukya, Navin K Rastogi
The present study deals with the effect of higher and lower molecular weight compounds present in the feed on concentration polarization during forward osmosis concentration and its mitigation by the application of ultrasound. The effects of ultrasound on transmembrane water flux at different forward osmosis membrane orientations and different model feed solutions consisting of sucrose and pectin have also been evaluated. The feed containing sucrose and pectin subjected towards active layer of the membrane was found to be the most suitable orientation...
January 2017: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/27756022/tertiary-wastewater-treatment-in-membrane-photobioreactor-using-microalgae-comparison-of-forward-osmosis-microfiltration
#18
COMPARATIVE STUDY
Prashant Praveen, Jonathan Yun Ping Heng, Kai-Chee Loh
Discharge of wastewater with high nitrogen and phosphorus content is a major cause of eutrophication. In this study, a microfiltration-based membrane photobioreactor (MPBR) and forward osmosis-based osmotic membrane photobioreactor (OMPBR) have been operated with Chlorella vulgaris for continuous tertiary wastewater treatment. Both the bioreactors exhibited good biomass accumulation (over 2g/L), although the OMPBR achieved better nutrients removal due to high rejection properties of the membranes. At 2days HRT, the OMPBR achieved nitrogen and phosphorus removal efficiencies of 86-99% and 100%, respectively, whereas the corresponding values in the MPBR were 48-97% and 46%, respectively...
December 2016: Bioresource Technology
https://www.readbyqxmd.com/read/27697688/biofouling-in-forward-osmosis-systems-an-experimental-and-numerical-study
#19
Szilárd S Bucs, Rodrigo Valladares Linares, Johannes S Vrouwenvelder, Cristian Picioreanu
This study evaluates with numerical simulations supported by experimental data the impact of biofouling on membrane performance in a cross-flow forward osmosis (FO) system. The two-dimensional numerical model couples liquid flow with solute transport in the FO feed and draw channels, in the FO membrane support layer and in the biofilm developed on one or both sides of the membrane. The developed model was tested against experimental measurements at various osmotic pressure differences and in batch operation without and with the presence of biofilm on the membrane active layer...
September 20, 2016: Water Research
https://www.readbyqxmd.com/read/27693970/effects-of-current-generation-and-electrolyte-ph-on-reverse-salt-flux-across-thin-film-composite-membrane-in-osmotic-microbial-fuel-cells
#20
Mohan Qin, Ibrahim M Abu-Reesh, Zhen He
Osmotic microbial fuel cells (OsMFCs) take advantages of synergy between forward osmosis (FO) and microbial fuel cells (MFCs) to accomplish wastewater treatment, current generation, and high-quality water extraction. As an FO based technology, OsMFCs also encounter reverse salt flux (RSF) that is the backward transport of salt ions across the FO membrane into the treated wastewater. This RSF can reduce water flux, contaminate the treated wastewater, and increase the operational expense, and thus must be properly addressed before any possible applications...
November 15, 2016: Water Research
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